<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function Person(name, age) {
  this.name = name;
  this.age = age;
}
Person.prototype.say = function () {
  console.log(`${this.name} ${this.age}`);
};

let p1 = new Person('张三', 18);
console.log(p1.__proto__);
console.log(p1);

    </script>
</body>
</html>